2138954020 has 144 divisors (see below), whose sum is σ = 5402654208. Its totient is φ = 696314880.

The previous prime is 2138954017. The next prime is 2138954021. The reversal of 2138954020 is 204598312.

It is not an unprimeable number, because it can be changed into a prime (2138954021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29300704 + ... + 29300776.

It is an arithmetic number, because the mean of its divisors is an integer number (37518432).

Almost surely, 2^2138954020 is an apocalyptic number.

2138954020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138954020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2701327104).

2138954020 is an abundant number, since it is smaller than the sum of its proper divisors (3263700188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2138954020 is a wasteful number, since it uses less digits than its factorization.

2138954020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 2138954020 is about 46248.8272283741. The cubic root of 2138954020 is about 1288.4487532991.

The spelling of 2138954020 in words is "two billion, one hundred thirty-eight million, nine hundred fifty-four thousand, twenty".